Introduction
In this article we will learn how to select only one row of a GridView using RadioButtons whereas normally a RadioButton does not support selection of only one RadioButton within a row.
Background
In ASP.Net the GridView control does not support selection of a single RadioButton that works as a group across rows. Generally as you know a RadioButton is a control that works in a group for selecting only one option. If we take RadioButtonList control it will work everywhere, which applies to a GridView also but if we use only one RadioButton control for each row in GridView it will not allow us to select only one. Try selecting a RadioButton in every row; it will allow selection of multiple rows in GridView. Here we will see how to restrict the user to select only one RadioButton within a GridView control.
For doing this task I've written some Javascript function. This function actually I got from somewhere while Google search. We will step by step follow.
Step 1
Start new website. Put the GridView control on the Default.aspx page with RadioButton control in TemplateField like bellow.
- <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
- DataKeyNames="AuthId">
- <Columns>
- <asp:TemplateField ShowHeader="false">
- <ItemTemplate>
- <asp:RadioButton ID="rdbauthid" runat="server" onclick="javascript:CheckOtherIsCheckedByGVID(this);" />
- </ItemTemplate>
- </asp:TemplateField>
- <asp:BoundField HeaderText="AUTHOR NAME" DataField="AuthName" />
- <asp:BoundField HeaderText="AUTHOR LOCATION" DataField="AuthLocation" />
- </Columns>
- </asp:GridView>
In the above you may see that in the Click event of the RadioButton control I call a Javascript function.
Step 2
Write the script as below for checking the current selection of the RadioButton control; if more than one is selected then the other selection is removed. Other than this there are two more methods to do same task.
- <script type="text/javascript">
- function CheckOtherIsCheckedByGVID(spanChk) {
- var IsChecked = spanChk.checked;
- if (IsChecked) {
spanChk.parentElement.parentElement.style.backgroundColor = '#228b22';
- spanChk.parentElement.parentElement.style.color = 'white';
- }
- var CurrentRdbID = spanChk.id;
- var Chk = spanChk;
- Parent = document.getElementById("<%=GridView1.ClientID%>");
- var items = Parent.getElementsByTagName('input');
- for (i = 0; i < items.length; i++) {
- if (items[i].id != CurrentRdbID && items[i].type == "radio") {
- if (items[i].checked) {
- items[i].checked = false;
items[i].parentElement.parentElement.style.backgroundColor = 'white'
- items[i].parentElement.parentElement.style.color = 'black';
- }
- }
- }
- }
- </script>
Step 3
Bind your GridView in aspx.cs page and run the application.
Conclusion
In this way we can restrict the user to select only one option via RadioButton in GridView.